Touch interface is terrible in almost every regard.
One drawback you didn't mention is that normally with a touch interface hand-distance to screen-distance is a 1-to-1 ratio. If I'm using a 27" display, I don't want to be dragging my hand back and forth a couple feet either way to drag icons.
That's why I think touch screens should be relegated to smaller devices (like the xps 13). I do not want to be using a touch screen to move things on a giant 27' display. I have a trackball for that.
Smaller than a computer monitor... but probably larger than a phone, since at small screen sizes the hit area will be so tiny it will be entirely obscured by your finger. God, I hate touch screens.
One drawback you didn't mention is that normally with a touch interface hand-distance to screen-distance is a 1-to-1 ratio. If I'm using a 27" display, I don't want to be dragging my hand back and forth a couple feet either way to drag icons.